Die-casting machine



Oct. l1, 1927.

G. A. THEOBALD ET AL DIE CASTING MACHINE original Filed April 2, 1923 5 Sheets-sheet g Y Oct. i1, 1927. ,645,167

G. A. THEOBALD ET AL y DIE CASTING MACHINE 5 Sheeizs-Sheet 2 Original Filed April 2, 1923 GIANT.

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G. A. THEOBALD ET AL DIE CASTING MACHINE Original Filed April 2, 19.25 5 Sheetsheet 3 Oct. 11,1927. 1,645,167

G. A. THEOBALD ET Al.

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Oct. 11,1927.

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Patented Oct. `l1, 1927.

1,645,167 UNITED STATES PATENT OFFICE. f

GEORGE A. THEOBALD AND THEODORE A. OLSON, 0F BOSTON, MASSACHUSETTS, AS-

SIGNORS T0 POLLOCK PEN COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORA- T'. [ON OF DELAWARE.

DIE-CASTING MACHINE.

Application lled April 2, 1928, Serial No. 629,522. Renewed March 3 1927.

This invention relates to improvements in die casting machines, and refers more particularly to a machine for die casting threaded slugs adapted to be used in connection with the sealing of cart-ridges for cartridge fountain pens.

The mechanism may, however, be utilized for numerous other purposes and castings automatically produced in a manner hereinafter disclosed.

Among the salient objects of the invention are to provide a machine in which seals or slugs are automatically and successively cast with an internal thread upon a male core; to provide a mechanism in which these cores are rotated automatically and the slugs automatically unscrewed .from the core members; to provide a-mechanism which is rapid and accurate in operation, and in general to provide a mechanism of the character referred to.

Fig. 1 is a side view of the mechanism with parts of the drive omitted.

Fig. 2 is a plan view of the mechanism shown in Fig. 1. Fig. 3 is an end view showing the drive with parts omitted. Fig: 4 is an enlarged detail of the unscrewing clutch and the cam disc. Fig. 5 is a fragmentary enlarged detail of the unscrewing clutch. Fig. 6 is a detail of the cam operating means. Fig. 7 is a planview of the shearing gate mechanism. Fig. 8 is a view taken along the line 8-8 in Fig. 7. Fig. 9 is a side view of the mechanism shown in Fig. 7. Fig. 10 is a detail view of the locking latch mechanism.

The functioning of the mechanism is brieiy as tollows: On the standard or base of the machine shown at 1 are ways 2 upon which is slidably mounted a slide 3 which has a reciprocatory movement. On this slide is a turret 4. rotatably mounted upon the stud 5. Radially positioned in the turret are the male cores shown at 6, which arerotated with the turret by means of a pivoted dog 7 which contacts a toothed indexing plate 8, the dog coming in contact with the teeth of the indexing plate with the reciprocation of the turret, thus indexing the turret successvely to an amount to position each succeeding core in alignment with the die. i

As the turret is rotated and aligned with the die, the reciprocation of the slide causes the core to enter the die and simultaneously with this action of the mechanism, a shot of metal is introduced through the metal spout 9 shown in Fig. 8, and a slug cast. The slide is again reciprocated to the next die member, the slug whichv is cast remaining on the end of the die member, and withdrawn from the die with the reciprocation of the turret. In a like manner each succeeding core is inserted into the die and a slug cast. Just subsequent to the casting of the slug, the shearing mechanism or die slide 10 shown in Figs. 7 and 8 is reciprof` cated shearing olf the-gate through W ich the metal is. introduced from the spout to the slug and clearing the passage for the next succeeding shot of metal.

Simultaneousl with this action at the opposite side o the turret, the slugs are being unscrewed from the cores by means of an unscrewing clutch 11 which is moved forward into en agement with the. slugs and unscrewing t em from the dies after which the slugs are released from the clutch and are ready to be used.

Describing now in more detail the movement of the slide relative the molding o eration, the slide 3 upon which the turret 1s mounted, is reciprocated by a. pivoted arm 12 upon the lower end of which is mounted a cam roller 13 acted upon by a cam, not shown.

The arm 12 is connected tothe slide by an adjustable connection shown at 14 by means of which the travel of the slide and turret may be accurately regulated. As the slide is reciprocated away from the molding die, one of the teeth of the indexing plate contacts with the front face of the pivoted dog 7, and due to the reciprocation of the slide indexes or rotates the turret to a position where the next succeeding core will be in alignment with the molding die.

With this rearwardreciproation of the slide there is also a pivoted locking latch 15 which is acted upon by cam plate 16 shown iii Fig. 10, tilting the latch and Withdrawing a plunger 17 from the hole 18 Iin the lower portion of the turret with which itl engages to hold the turret ri idl from rotation. This withdrawal o t e locking plunger 17 takes lace just prior to the contacting of the in exing plate with the pivoted dog.

of a sprin 18* acting upon the opposite end of thze latc from that engaged by the plunger 1 v With the return movement of the slide and l' turret, the indexing plate will pass over the Vto lof the dog due to its pivoted mounting.

e molding operation consists first in the lining u of the turret with'the die by means o a linin plunger 19 which enters the aperture 20 1n the 'top lining plate 21 mounted on the `turret above the core members. This lining plunger is positioned somewhat ahead of t e die so as to line the turret with the die prior to the casting operation. The cores 6 which are mounted in bushin s 22 cushioned by means of spring 23, an held in place in the sleeves 24 mounted in the turret are held in place by means of bolts 25 running lon 'tudinally of the bushings and sleeves. T us with the advancing of the core and die member the action is cushioned due to the'sprin 23.

When the core' is inserte into the die, the latter being shown at 26, a shot of metal forced by ressure from any suitable reservoir, not s own, is forced from the nozzle 9 through the gate 27 and into the space be tween the core and die shown at 28. After the casting of the slug, the slide is again reciprocated in the turret and indexed to the next core which is inserted with the return reciprocation of the turret. Thus each core is rotated into alignment with the die and a. slu cast thereon.

After t e die .casting operation, the die slide 10 is reciprocated due to the actionof the bell crank 29 which is rotated on its pivot 30 in the direction shown by the arrows in Fig. 2. This movement is transmitted to the bell crank through connection 31 which is attached to a vertical bar 32 iv- `oted on the shaft 33, the opposite end o the bar 32 having mounted thereon a cam roller not shown, lwhich is acted upon by a cam mounted upon a shaft, both of which are omitted from the drawing. With the reciprocation of the die slide, a bridged wedge shown at 34 in Figs. 7 and 8 is acted upon by the stationary cam 35 which shifts the wedge transversely, shearing the metal formed in the gatev 27 from the back of the cast slug and-e1ects it at the side of the die slide at the bevel portion shown at 36, the metal fallin back into the metal pot to be remelted an the die slide being reciprocated back to castin position. Thus, with each successive mol ing operation the die slide is reciprocated and cool" metal formed in the gate between the .metal nozzle and the slug 1s sheared and ejected, leaving the gate clear for the next castin operation.

Adjustments an cushioning springs are shown in Fig. 2 in the connections between the bell crank and the die `slide to effect proper adjustments.

' `ubstantially simultaneously with the die casting operation, aI slug is unscrewed from one of the cores diametrically opposite the core which is bein used in moldin a slug. This mechanism 1s most clearly s own in Figs. 1, 2, 4, 5 and6. The turret is similarly aligned for the removal of the* slugs by means of a lining plunger 37 entering one of the. apertures 20 in the lining-plate similar to the action of the lining plunger 4shown at 19 during the molding operation. This iningplunger is advanced due to the action of the cam Way 38 in the cam disc 39, which actsv` upon a cam roller 40 slidably mounted upon the gibs 41 which carry the unscrewing clutch 11 and the shaft upon which the lining plunger 37 and the shaft 42 upon which the lining plunger 37 is mounted.' After bef ing lined withthe lining plunger, the unscrewing clutch 11 is then advanced to engage the slug 28 due to the tapering character of the mouth of the lunger shown'v at 43.

The clutch is constant y rotating and unscrews the slug from the core 6. To assure the gripping of thevseal, the inner tapered mouth of the clutch is corrugated.

When the clutch has moved forward and the seal has been unscrewed from the core as shown in` Fig. 4, a detent pin 44' held against the rotatmg sleeve 45 by means of a s ring 46 is held between the ridge 47 and t e collar 48 on the sleeve. When the clutch is retarded, dueto the action of the cam disc 39, a rod 49 within the hollow shaft 50 contacts against the end of the plun er 51 into whichis screwed the ejecting 'p unger 52. This serves to eject the slug as shown in Fig. 5, the ejecting plunger working against the tension of thecushion spring 53 positioned between the ejecting rod 51and the sleeve 45 which has the tapered mouth and carries the slug. With c'this ejection of the slugfrom the mouth of the sleeve by the plunger 52, the detentdpin is caused to ride over-the top of the ri ge 47 and holds the sleeve in position until theclutch is again returned, or advanced by the cam` disc to unscrew the next oncoming slug from its core.

Power to drive is transmitted from the shaft 54 shown in Fig. 3 through bevel gears 55 and 56 to, a vertical shaft 57, thence throughthe bevel gears 58 and 59 shown in Fig. 2 to the two separate trains of gears shown at 60,61, 62 and 63 and 64, the gears 60 and 61 driving .the shaft 65 upon which The mechanism is entirely automatic, the casting of the slu s being successively performed on each o .the cores mounted upon the rotating turret and the slugs unscrewed from the cores when the are rotated in position and aligned so t at the unscrewing clutch engages, unscrews and ejects the slugs therefrom. .Y

The slugs produced are perfect in form and may be more rapidly manufactured than when made on a screw machine.

Also, there is no loss of metal as the metal cools in the gate and is sheared from the back of the slug, and remelted for reuse.

Claims:

l. A die casting machine of the characte described, consisting in a frame having a reciprocating means mounted thereon, a 'die and a metal supply means communicating therewith, a, rotatable element carried by the reciprocating means having die closure members thereon adapted to (zo-operate with the die during molding periods to form slugs, and means for automatically removing the slugs from the die closure members.

2. A-die casting machine of the character described consisting in a frame having reciprocating means mountedthereon, a die and metal supply means communicating therewith, an element carried by the reciprocating means and automatically rotated thereby having die closure means mounted thereon, said closures adapted to successively register with the die during the molding operations to form slugs, and means for automaticall removing the slugs.

3. A ie casting machine of the character described, consisting in a frame having a reciprocating means mounted thereon, a die and a metal supply means communicating therewith, a rotatable element having core members thereon adapted to co-operate with the die during the molding operation to form slugs, means for automatically removing the slugs from the cores. l

4. A die casting machine of the character described, consisting in a frame having a reciprocating means mounted thereon, a die and a metal supply means communicating therewith, an element carried by the reciprotating means and automatically rotated thereby adapted to co-operate with the die during the molding operation to form slu and means for Vautomatically removing t e slugs from the cores.

5. A die casting machine of the character described, consist-ing in a. frame having a reciprocating means mounted thereon, a die and a metal suppl means communicating therewith, a rotata le element having core members thereon adapted to co-operate with the die during the molding periods to form slugs, means for automatically separating the slugs from the metal supply means, and means for automatically removing the slugs from the cores.

GEORGE A. THEOBALD. THEODORE'A. OLSON. 

